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首页> 外文期刊>Journal of Materials Engineering and Performance >Evaluation of the Low Heat Input Process for Weld Repair of Nickel-Base Superalloys
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Evaluation of the Low Heat Input Process for Weld Repair of Nickel-Base Superalloys

机译：镍基高温合金焊接修复低热量输入工艺的评价

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摘要

The repair of turbine blades and vanes commonly involves gas tungsten arc welding or an equivalent process, but unfortunately these components are often susceptible to heat-affected zone (HAZ) cracking during the weld repair process. This is a major problem especially in cast alloys due to their coarse-grain size and where the (Al + Ti) contents is in excess of 3-4%; vacuum brazing is also used but mainly on low stress non-rotating components such as vanes. Micro-welding has the potential to deposit small amounts of filler at low heat input levels with minimum HAZ and thus is an attractive process for depositing a quality weld. As with conventional fusion processes, the filler alloy is deposited by the generation of a low power arc between a consumable electrode and the substrate. The low heat input of this process offers unique advantages over more common welding processes such as gas tungsten arc, plasma arc, laser, and electron beam welding. In this study, the low heat input characteristic of micro-welding has been used to simulate weld repair using Inconel (IN) (Inconel and IN are trademarks of INCO Alloys International) 625, Rene (Rene is a trademark of General Electric Company) 41, Nimonic (Nimonic is a trademark of INCO Alloys International) 105 and Inconel 738LC filler alloys, to a cast Inconel 738LC substrate. The effect of micro-welding process parameters on the deposition rate, coating quality, and substrate has been investigated.
机译：涡轮机叶片和叶片的维修通常涉及钨极电弧焊或等效工艺，但是不幸的是，这些部件在焊接维修过程中经常容易受到热影响区（HAZ）裂纹的影响。特别是在铸造合金中，这是一个主要问题，因为它们的晶粒粗大并且（Al + Ti）含量超过3-4％。也使用真空钎焊，但主要用于低应力的非旋转部件，例如叶片。微焊接具有在低热输入水平下以最小的热影响区沉积少量填料的潜力，因此是一种用于沉积优质焊缝的有吸引力的工艺。与传统的熔融工艺一样，通过在可消耗电极和基材之间产生低功率电弧来沉积填充合金。与气体钨极电弧，等离子弧，激光和电子束焊接等更常见的焊接工艺相比，该过程的低热量输入具有独特的优势。在这项研究中，微焊接的低热量输入特性已被用于模拟使用Inconel（IN）（Inconel和IN是INCO Alloys Internationals的商标）的焊缝修复625，Rene（Rene是General Electric Company的商标）41 ，将Nimonic（Nimonic是INCO Alloys International的商标）105和Inconel 738LC填充合金铸造到铸造的Inconel 738LC基底上。研究了微焊接工艺参数对沉积速率，涂层质量和基材的影响。

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